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@nitro gutters gettoni @frn JOHN D. DALE, O F ROCHESTER, NRW- YORK. Letters Patent No. (3,513, dated January 21, 1868.

IMPROVEMENT: IN APPARATUS PORDISOOVRRING THR rissURRs IN THR sDL's or WELLS.

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Be itknown that I,-J0IIND.DAAI ofJRochester, in the county of Monroe, and State of New York, have I invented certain new and useful Improvements in-Devices for Indicating the Position and Form of Crevices in Oil-Wells; `and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying` drawings, making part of-'this specication.

Eigure 1 is a. longitudinal section of my improved device withthe indicator' drawn in..

Figure 2, an elevation with thendicator extended., I i

Figure, section of the pole and-rod at the line A A, g.. 1.

Figure 4, view of one side of -the head.

Figure 5, section of the head at lineB'B, iig. 1.

Figure 6, view of the adjusting-gauge.

Figures 7 and 8', views ofthe indicator detached.

Like letters of reference indicate corresponding parts in-nll the iigures.

The object of my improvement is -to ascertain the position andform of crevices in oil-wells, so that the tubing can be accurately adjusted thereto.

The invention consists, first, in' the combination of an adjustable gauge with the sliding head, for the purpose-oi` fitting the bore of the well, and second, in the combination ofen expanding indicator with the head, 'for projecting out when entering a cavity, and acting as an arm to indicate its position and size.

The head is simply a hollow block, of suitable form and diameter. In 'the drawings it is shown, ns made of two parts, C l), secured together by bolts, and attached t`o the end of'a pole, A, which is lowered into the well. O ver the back of the head ts a. ganga-E, which is attached by means of lugs on opposite sides, having slots, L L, through which pass set-screws, m m1. This arrangementallows thegauge to' be set out or in, as necessity may require.l Any equivalent adjustment of `the gauge may be employed.A Within the head is situated an arm, F.1w'hich formsthe indicator. With its upper end is connected a rod'or-wire, H, extending up through staplesn 'o tothe top of'the Well. Theindicator is preferably provided with bearings, G G, which slide up and down in grooves M M of the/head, lig. 5, and alsowith a' slot, K, ruuningover o. bolt, J, to gauge'the prdtrusion ofthe indicator, and to form a joint to the same when down. .The end ot" theindicator is also preferably provided withafrictiomroller, j. `The above-described arrangement of the indicator may be varied as maybe desired.

The-'operation of this device will be readily understood. The gauge 'E is first adjusted to fit closely the diamtciot. the well, and the device is then lowered, wththe indicatordrnwn in, as shown in lig. 1. Whenever a. crevice'is reached, the indicator F will drop down of lits own weight and project into it, as shown in g. 2. Then,'b`y simply pressing the rod H down, so as to keep the indicator extended, and moving the pole up'and down, so that the indicator will strike the top and bottom of the crevice, the length and position of the latter will be indicated by means of a scale of feet on the pole. By turning the device on itsA axis, the diameter of the crevice at diterent positions con also be accurately measured, and thus the size and form of the crevicewill be obtained. By turning the device as itggoesdown, it' will be seen that the crevices can he easily found if there-are any. i v

A What I claim as my invention, and desire to secure by Letters Patent, is-

-1. The combination, with the head, of an adjusting-gauge, E, for"adapting the device to the diameter of the bore, as specified. Y

2. The combination, with the head, of on indicator, F, as described, and for the purpose set''orth` JOHN D.- DALE.

Witnesses:

JOHN H. DALE, GUsLrAv JANEK'I, 

